Motor for a power tool

ABSTRACT

A power tool has a motor with end caps secured by cold forming to the motor. The end caps include bearings retained in the end cap by deformation of the end cap. The motor includes an armature shaft which is staked to retain laminates as well as a retainer on the shaft. Also, a pinion gear with a shoulder which limits movement of the shaft in the motor. A fan is on the motor armature which is secured by an adhesive which changes color during assembly. The motor also includes a demagnetization member which increases resistance to demagnetization due to elevated temperature, as well as armature reaction field.

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims priority to Provisional ApplicationSerial No. 60/298,261 filed Jun. 14, 2001.

FIELD AND BACKGROUND OF THE INVENTION

[0002] The present invention relates to power tools and, moreparticularly, to motors for power tools.

[0003] All electric power tools, whether AC or DC powered, utilizemotors to drive the outputs of the tools. Motors are a critical part ofthe power tool. Designers strive to improve various aspects of themotors in power tools. Specifically, designers strive to reduce motorsize while increasing motor output. Designers try to reduce heat createdby the motor. Designers strive to reduce the number of parts associatedwith the motor. Also, designers strive to reduce the possibility ofdemagnetization of the motor during operation. In short, motorimprovement improves the overall performance of the power tool.

[0004] The present invention provides the art with an improved motorassembly. The motor includes various features which reduce the totalnumber of parts in the motor, improve assembly, enable simplermanufacturing techniques, as well as increase the resistance of themotor to demagnetization.

SUMMARY OF THE INVENTION

[0005] In accordance with a first aspect of the invention, a power toolincludes a motor comprising an end cap. The end cap has a base with amechanism on the base to secure the base with the motor can. A recess isin the base to receive a bearing. The recess also includes an apertureto receive an armature shaft. A bearing is positioned within the recess.A portion of the base is disformed adjacent to the recess to retain thebearing in the recess. The deformation may be an annular shoulder aroundthe entire bearing or it may be segmented with a number of segmentsdeformed in a circular pattern around the bearing. Also, a method ofretaining a bearing in the motor end cap includes positioning thebearing into the recess, deforming the motor end cap adjacent therecess, and fixing the bearing in the recess.

[0006] In accordance with a second aspect of the invention, the powertool includes a motor comprising an armature shaft assembly. Thearmature shaft assembly includes a shaft which includes a plurality ofstakes in its outer peripheral surface. The stakes extend a desiredlength along the longitudinal axis of the shaft. A plurality oflaminates are positioned on the shaft. The plurality of laminates havean aperture which slips onto the shaft and is then pressed on andretained by the plurality of stakes on the shaft. A retaining memberwhich includes a bore is also slipped onto the shaft. The retainer ispressed onto the plurality of stakes to maintain position of theretainer on the shaft. The retainer is a metal part. The retainer, alongwith the laminates, are coated to provide additional resistance againstmovement with respect to the shaft.

[0007] According to a third aspect of the invention, a power toolincludes a motor assembly comprising a motor can having two ends. Eachend includes an end cap. An armature mechanism is rotatably positionedwithin the motor can. The armature mechanism includes a shaft with aportion of the shaft extending from one of the end caps to receive apinion gear. A pinion gear is positioned on the shaft. The pinion gearincludes a shoulder extending towards the end cap. The shoulder isadapted to limit movement of the armature mechanism in the motor can.The shoulder has a desired length to enable a clearance between acommutator and the other end cap in the event of movement of thearmature mechanism.

[0008] According to a fourth aspect of the invention, a power toolincludes a motor with a fan positioned on the armature. The armature isprovided and the fan is coupled with the armature assembly. An adhesiveis placed onto the fan to secure the fan to the armature assembly. Theadhesive is a first color, generally bright yellow, when the adhesive iswet. The adhesive is enabled to cure to permanently fix the fan to thearmature assembly. Upon curing, the adhesive changes color from a firstcolor to a second color. Preferably, the second color is brown. Thisenables an assembly line worker to realize that the fan has either justbeen positioned onto the armature assembly, by viewing the bright yellowcolor, or that the fan adhesive is cured and the fan is fixed onto thearmature assembly to enable further assembly of the motor.

[0009] In accordance with a fifth aspect of the invention, a power toolincludes a motor which comprises an end cap secured with the motor can.The motor can includes a plurality of extending fingers. The end cap isprovided with a plurality of recesses corresponding to the number of theplurality of fingers. The end cap is positioned with the motor cap suchthat the plurality of fingers mesh with the plurality of recesses. Theextending fingers are cold worked to deform the fingers at the end cap.This deforming secures the end cap with the motor can via the pluralityof deformed extending fingers. This method of attaching the end cap tothe motor can also centers the end cap on the motor can.

[0010] In accordance with a sixth aspect of the invention, a power toolincludes a motor which has an increased resistance to demagnetization.The motor comprises a motor can having two ends with end caps coupledwith the ends of the motor can. An armature assembly is rotatablypositioned within the motor can. A magnetic mechanism is positioned inthe motor can. The magnetic mechanism includes a housing with at leastone magnet secured to the housing. The housing includes at least oneaperture with the at least one magnet including magnetic material whichextends into the aperture filling the aperture with magnetic material.The increased magnetic material portion of the at least one magnetreduces the susceptibility to armature reaction demagnetization at thatposition. The housing may include a ring member which is positionedwithin the motor can. Also, when the ring member is used, the motor canmay include at least one aperture aligned with the other aperture toreceive additional magnetic material to increase the resistance todemagnetization. Also, the motor can itself may act as the housing andinclude the at least one aperture.

[0011] From the following detailed description, taken in conjunctionwith the drawings and subjoined claims, other objects and advantages ofthe present invention will become apparent to those skilled in the art.

BRIEF DESCRIPTION OF THE DRAWINGS

[0012]FIG. 1 is a partially in cross-section plan view of a power toolin accordance with the present invention.

[0013]FIG. 2 is an exploded view of the motor of FIG. 1.

[0014]FIG. 3a is a cross-section view of the end cap of FIG. 2 alongline 3-3 thereof.

[0015]FIG. 3b is a cross-section view of the end cap of FIG. 2 prior todeforming of the end cap.

[0016]FIG. 4a is an exploded perspective view of the armature assemblyof FIG. 2.

[0017]FIG. 4b is an assembled view of FIG. 4a.

[0018]FIG. 4c is a cross-section view through lines 4 c-4 c of FIG. 4b.

[0019]FIG. 4d is a cross-section view of FIG. 4b along line 4 d-4 dthereof.

[0020]FIG. 5 is an enlarged section view of the motor of FIG. 1.

[0021]FIG. 6a is a perspective view of a fan prior to assembly with thearmature assembly.

[0022]FIG. 6b is an elevation view partially in section of the armatureassembly with the fan attached.

[0023]FIG. 7a is an exploded perspective view of the motor can with endcaps.

[0024]FIG. 7b is a perspective view of one of the end caps on the motorcan.

[0025]FIG. 7c is an elevation view of the end cap secured to the motorcan.

[0026]FIG. 8a is a perspective view partially in section of the magnetmechanism for providing an increase resistance to demagnetization.

[0027]FIG. 8b is a perspective view partially in section of the magnetmechanism within the motor can.

[0028]FIG. 8c is a perspective view partially in section of the motorcan being a part of the magnet member.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] Turning to FIG. 1, a power tool in accordance with the presentinvention is illustrated and designated with the reference numeral 10.The power tool 10 is illustrated as a drill; however, any type of powertool such as a screwdriver, sander, rotary tool, clippers, saw or thelike which utilize an electric motor may be used with the motor of thepresent invention. The power tool 10 includes a housing 12 whichsurrounds a motor 14. An activation member 16 is coupled with the motor14 as well as with a power source 18. The power source 18 may be a powercord (AC current) as shown or the power tool may have a battery (DCcurrent). The motor 14 is coupled with an output 20 which may include atransmission 22 and a chuck 24 to retain a tool (not shown) with thedrill.

[0030] The motor 14 includes a magnetic stator assembly 30 whichincludes a motor can 32, flux ring 34, and magnets 36 and 38. Anarmature 40 includes a shaft 42, a rotor 44 with laminations 46 andwindings 48, as well as a commutator 50 coupled with the shaft 42. Themotor also includes end caps 52 and 54. The end cap 52 includes abearing 56 which balances one end of the shaft 58 which is coupled witha pinion 60. Brushes 62 and 64 are associated with the commutator 50. Abearing 70 is coupled with the end cap 54 to balance rotation of theshaft 42.

[0031] Turning to FIGS. 2 and 3, the end cap 52 is illustrated. The endcap 52 has an overall circular configuration with a central recess 72housing bearing 56. The recess 72 includes a bore 74 which enablespassage of the shaft 42. The end cap 52 also includes a plurality ofcut-outs or recesses 76 on the periphery of the end cap 52. A shoulder78 is formed by a deformation of a portion of the end cap adjacentrecess 72. The deformation groove 80 may be circular and surround thebearing 56. Alternatively, there may be a number of disjointed groovesegments forming a circular pattern. Also, the end cap 52 is generallyformed from a metallic material which may be stamped with a desiredconfiguration as well as including the recesses and apertures.

[0032] Turning to FIG. 3b, the method for forming the end cap will bebetter explained. FIG. 3b illustrates a cross-section of the end cap 52prior to the bearing 56 being permanently affixed to the end cap 52. Ascan be seen, the recess 72 is sized to receive the bearing 56. Thebearing 56 is positioned within the recess 72. A tool 90 having acentering member 92 and a deformation member 94 is positioned withrespect to the end cap so that the positioning member 92 fits within thebore of the bearing 56 as well as the bore 74 of the end plate 52. Asthis occurs, the deformation member 94 contacts the end cap 52 formingthe shoulder 78. Accordingly, the deformation member 94 may becontinuous or discontinuous (as shown in phantom in FIG. 3b) to form thegroove 80.

[0033] Turning to FIGS. 4a-4 d, parts of the armature 40 are shown.Here, the laminations 46, shaft 42 and retainer 96 are shown. The shaft42 includes a plurality of stakes 98 which run longitudinally withrespect to the axis of the shaft 42. The stakes 98, generally four innumber, extend a desired distance along the shaft. However, the stakes98 do not extend to the ends of the shaft. Thus, smooth portions are ateach end of the shaft 42. The stakes do have a desired length in orderto receive and retain the laminations 46 as well as the retainer 96. Thelaminations 46, as seen in FIG. 4c, have a desired design with a centralaperture which is substantially circular. The laminations 46 are slidonto the shaft over the smooth ends until they are pressed and retainedon the stakes 98. Likewise, the retainer 96 is cylindrical, having acylindrical bore. The retainer 96 slides onto the end of the shaft untilit contacts the stakes 98. At that time, the retainer 96 is pressed ontothe shaft so that the stakes retain the retainer 96 onto the shaft 42.The retainer 96 is generally metallic or a powder metal part.Accordingly, the retainer 96 can ride directly against the bearing 56provided that the thrust pressure/velocity limits of the material arenot exceeded. This eliminates the need for additional washers betweenthe retainer and sleeve bearing 56. Also, an epoxy coating is on thelaminates 46 and retainer 96 to enhance retention on the shaft 42.

[0034] Turning to FIG. 5, the pinion gear 60 is illustrated. The piniongear 60 includes teeth 102 as well as a central bore 104. Also, ashoulder 106 is unitarily formed with the pinion gear 60. The shoulder106 has a desired length and extends towards the end cap 52. In themotor 14, it is critical to maintain a clearance 55 between thecommutator 50 and end cap 54. If this clearance is not kept, it ispossible that the motor may seize. The shoulder 106 helps to limit themovement of the armature shaft 42 and commutator 50. If the armatureshaft 42 slips in the bearings 56 and 70, the pinion shoulder 106eventually contacts the bearing 56 which is fixed to the end cap 52.Accordingly, the armature shaft 42 may only slip a desired amount sothat the commutator clearance is always present to prevent seizing ofthe motor.

[0035] Turning to FIG. 6a, the motor fan 108 is illustrated prior to theattachment with the armature 40. As can be seen, the fan 108 has anoverall disc shape with blades 109 and a plurality of extending fingers110. The extending fingers 110 press into gaps 112 in the laminations46. This is illustrated in FIG. 6b. Once the fingers 110 are pressedinto the gaps 112, the fan 108 is coupled with the armature 40. Afterthe coupling, an adhesive 114 is placed onto the fingers 110 andlaminates 46. At the time the adhesive 114 is applied, it is wet and theadhesive is a first color, preferably a bright yellow. After theadhesive 114 cures, the fan 108 is permanently secured to the armature.After the curing of the adhesive 114, the adhesive changes color to asecond color. Preferably, the cured color is brown. Thus, a personassembling the motor may visually determine whether or not the fan hasbeen permanently secured to the laminates. The color brown indicatingthat the adhesive is cured and, in turn, the fan affixed to thelaminates 46. Alternatively, if the fan has just been adhered to thelaminates 46, the bright yellow color is present. Thus, the assemblercan easily visually detect whether or not the armature, which includesthe fan 108, is ready for additional assembly.

[0036] Turning to FIG. 7a, the motor can 32 is shown. The motor can 32includes a plurality of extending fingers 116. The fingers 116 mesh withthe recesses 76 in the end cap 52. Also, end cap 54 includes recesses118 which mesh with the extending fingers 116 on the other end of themotor can 32. As seen in FIG. 7b, the end plate 52 has been coupled withthe motor can 32 so that the fingers 116 and recesses 76 are in ameshing condition. After the positioning, the fingers 116 are coldworked to deform the fingers 116 so that the end caps are permanentlysecured to the motor can 32 as illustrated in FIG. 7c. As can be seen inFIG. 2, the fingers 116 are deformed, having a trapezoidal shape, sothat the fingers secure the end cap 52 to the motor housing 32. Thiscold working is also utilized to retain end cap 54 to the motor can 32.

[0037] Turning to FIG. 8a, the demagnetization stator member 30 isshown. The demagnetization member 30 includes a ring 120 as well asmagnets 36 and 38. The ring 120 includes at least one aperture 122strategically positioned to receive magnetic material as the magnets 36and 38 are injection molded into the ring 120. Also, the ring includesanchors 124 like those described in pending U.S. patent application Ser.No. 09/764,004 filed Jan. 17, 2001 entitled ANCHORING SYSTEM FORINJECTION MOLDED MAGNETS ON A FLUX RING OR MOTOR HOUSING, thespecification and drawings of which are herein expressly incorporated byreference. Also, a plurality of apertures 122 may be strategicallypositioned around the ring 120. The magnets 36 and 38 are generally aneodymium iron boron material. This material is susceptible todemagnetization due to the amount of time the magnet spends at anelevated temperature as well as due to the armature reaction field.Thus, by adding more magnetic material, demagnetization due to thearmature reaction field is reduced. Thus, the thicker the magnet is atspecific locations, the better the magnet is at reducing this type ofdemagnetization. Also, by optimizing the location of the increasedthickness magnet, which increases the magnetic strength, this reducessusceptibility to armature reaction demagnetization due to temperature.Accordingly, the thicker magnet partitions are positioned in the highestareas of demagnetization.

[0038] Turning to FIG. 8b, a motor can 32′ is illustrated with apertures126. Here, the ring 120 would be secured to the motor can prior to theinjection molding of the magnets 36 and 38. The apertures 122 would bealigned with apertures 126. Accordingly, when the magnetic material isinjection into the ring 120, the magnet material would pass through theaperture 122 into aperture 126 of the can 32′. This, in turn, increasesthe thickness of the magnet at the desired position. This thickness, inturn, increases resistance to demagnetization.

[0039] Turning to FIG. 8c, an additional motor can 32″ is shown. Here,the magnets 36 and 38 are injection molded directly onto the motor can32″. The apertures 126, as well as the anchors 124, provide theirdesired features as mentioned above.

[0040] The ring 120 includes an alignment notch 140. The alignment notch140, during the injection molding of the magnets 36, 38, is placed overa pin in the mold tooling. This properly aligns the ring 120 in thetooling which, in turn, enables proper positioning of the magnets 36, 38on the ring 120 so that the magnets are molded onto the anchors. Also,the notch 140 is used to align the flux ring 120 with respect to themotor can during assembly. Again, the notch 140 is placed over analigning pin as the ring is positioned into the motor can.

[0041] While the above detailed description describes the preferredembodiment of the present invention, the invention is susceptible tomodification, variation and alteration without deviating from the scopeand fair meaning of the subjoined claims.

What is claimed is:
 1. A method of retaining a bearing in a motor endcap, comprising: producing a motor end cap including a recess in saidmotor end cap; positioning a bearing into said recesses; deforming saidmotor end cap adjacent said recess; and fixing said bearing in saidrecess.
 2. The method according to claim 1, wherein said deforming stepfurther comprising moving a portion of said motor end cap radiallyinward forming a shoulder for fixing said bearing in said recess.
 3. Themethod according to claim 1, wherein said deforming being by staking. 4.The method according to claim 1, wherein said deforming radiallyinwardly displacing a ring of material from said motor end cap forfixing said bearing in said recess.
 5. The method according to claim 1,wherein said deforming radially inwardly displacing segments of saidmotor end cap, said segments positioned in a circle about said recess,for fixing said bearing in said recess.
 6. A motor end cap, comprising:a base; a mechanism on said base for securing with a motor can; a recessin said base, said recess including an aperture for receiving anarmature shaft; a bearing in said recess; and a portion of said basedeformed adjacent said recess for retaining said bearing in said recess.7. The motor end cap according to claim 6, wherein said deformed basebeing an annular shoulder portion.
 8. The motor end cap according toclaim 6, wherein said deformed base being segments positioned along acircle surrounding said bearing.
 9. An armature shaft assembly for amotor, comprising: a shaft, said shaft including a plurality of stakesin its outer peripheral surface; said stakes extending a desired lengthalong a longitudinal axis of the shaft; a plurality of laminates on saidshaft, said plurality of laminates have an aperture which slips ontosaid shaft and is pressed on and retained by said plurality of stakes onsaid shaft; a retaining member having a bore, said bore enabling saidretainer to slip on said shaft, said retainer pressed onto saidplurality of stakes to maintain position of said retainer on said shaft.10. The armature shaft assembly according to claim 9, wherein saidretainer is a metal part.
 11. The armature shaft assembly according toclaim 9, wherein a coating is placed on said laminates and retainer toprovide additional resistance against movement with respect to saidshaft.
 12. A motor assembly, comprising: a motor can having two ends, anend cap at each end of said motor can; an armature mechanism in saidmotor can, said armature mechanism including a shaft, a portion of saidshaft extending from one of said end caps to receive a pinion gear; astator assembly including a pair of magnets; a pinion gear positioned onsaid shaft, said pinion gear including a shoulder extending toward saidend cap, said shoulder adapted to limit movement of said armaturemechanism in said motor can.
 13. The motor assembly according to claim12, wherein said shoulder having a desired length to enable a clearancebetween a commutator and the other end cap in the event of movement ofthe armature mechanism.
 14. A method for securing a fan to a motorarmature, comprising: providing a motor armature assembly; coupling afan with said motor armature assembly; placing an adhesive on said fanto secure said fan to said armature assembly, said adhesive being afirst color when said adhesive is wet; enabling said adhesive to cure,permanently fixing said fan to said armature assembly wherein uponcuring said adhesive changes from said first color to a second color.15. The method according to claim 14, wherein said first color beingyellow.
 16. The method according to claim 14, wherein said second colorbeing brown.
 17. A method of securing an end cap with a motor can,comprising: providing a motor can including a plurality of extendingfingers; providing an end cap including a plurality of recessescorresponding in number to said plurality of extending fingers;positioning said end cap on said motor can such that said plurality offingers mesh with said plurality of recesses; cold working saidextending fingers; deforming said plurality extending finger by saidcold working; and securing said end cap with said motor can by saidplurality of deformed extending fingers.
 18. The method according toclaim 17, further comprising centering said end cap on said motor can.19. A motor having an increased resistance to demagnetization,comprising: a motor can having two ends with end caps coupled with saidtwo ends of said motor can; an armature assembly rotatably positioned insaid motor can; magnetic mechanism positioned in said motor can, saidmagnetic mechanism including a housing with at least one magnet securedto said housing, said housing including at least one aperture, said atleast one magnet including material filling said at least one aperture,wherein a magnet localization occurs at said at least one aperturereducing susceptibility to demagnetization.
 20. The motor according toclaim 19, wherein said housing being a ring member positioned in saidmotor can.
 21. The motor can according to claim 20, wherein said motorcan includes at least one aperture aligned with said housing at leastone aperture and said motor can aperture receiving magnet material. 22.The motor can according to claim 19, wherein said motor can being saidhousing and including said at least one aperture.
 23. A motor assembly,comprising: a motor can having two ends, an end cap at each end of saidmotor can, one of said end caps comprising: a base; a mechanism on saidbase for securing with a motor can; a recess in said base, said recessincluding an aperture for receiving an armature shaft; a bearing in saidrecess; and a portion of said base deformed adjacent said recess forretaining said bearing in said recess; an armature assembly in saidmotor can, said armature assembly including a shaft having ends receivedin said end caps; and a stator assembly including a pair of magnetssurrounding said armature assembly, said stator assembly positioned insaid motor can.
 24. The motor end cap according to claim 23, whereinsaid deformed base being an annular shoulder portion.
 25. The motor endcap according to claim 23, wherein said deformed base being segmentspositioned along a circle surrounding said bearing.
 26. A motorassembly, comprising: a motor can having two ends, an end cap at eachend of said motor can; an armature assembly in said motor can, saidarmature assembly including a shaft, said shaft including a plurality ofstakes in its outer peripheral surface; said stakes extending a desiredlength along a longitudinal axis of the shaft; a plurality of laminateson said shaft, said plurality of laminates have an aperture which slipsonto said shaft and is pressed on and retained by said plurality ofstakes on said shaft; a retaining member having a bore, said boreenabling said retainer to slip on said shaft, said retainer pressed ontosaid plurality of stakes to maintain position of said retainer on saidshaft received in said end caps; and a stator assembly including a pairof magnets surrounding said armature assembly, said stator assemblypositioned in said motor can.
 27. The armature shaft assembly accordingto claim 26, wherein said retainer is a metal part.
 28. The armatureshaft assembly according to claim 26, wherein a coating is placed onsaid laminates and retainer to provide additional resistance againstmovement with respect to said shaft.
 29. A power tool, comprising: ahousing; a motor positioned in said housing, said motor comprising: amotor can having two ends, an end cap at each end of said motor can, oneof said end caps comprising: a base; a mechanism on said base forsecuring with a motor can; a recess in said base, said recess includingan aperture for receiving an armature shaft; a bearing in said recess;and a portion of said base deformed adjacent said recess for retainingsaid bearing in said recess; an armature assembly in said motor can,said armature assembly including a shaft having ends received in saidend caps; and a stator assembly including a pair of magnets surroundingsaid armature assembly, said stator assembly positioned in said motorcan; an output coupled with said motor; an activation member coupledwith said motor for energizing said motor; and a power source coupledwith said motor and activation member for providing power to said tool.30. The motor end cap according to claim 29, wherein said deformed basebeing an annular shoulder portion.
 31. The motor end cap according toclaim 29, wherein said deformed base being segments positioned along acircle surrounding said bearing.
 32. A power tool, comprising: ahousing; a motor positioned in said housing, said motor comprising: amotor can having two ends, an end cap at each end of said motor can; anarmature assembly in said motor can, said armature assembly including ashaft, said shaft including a plurality of stakes in its outerperipheral surface; said stakes extending a desired length along alongitudinal axis of the shaft; a plurality of laminates on said shaft,said plurality of laminates have an aperture which slips onto said shaftand is pressed on and retained by said plurality of stakes on saidshaft; a retaining member having a bore, said bore enabling saidretainer to slip on said shaft, said retainer pressed onto saidplurality of stakes to maintain position of said retainer on said shaftreceived in said end caps; and a stator assembly including a pair ofmagnets surrounding said armature assembly, said stator assemblypositioned in said motor can; an output coupled with said motor; anactivation member coupled with said motor for energizing said motor; anda power source coupled with said motor and activation member forproviding power to said tool.
 33. The armature shaft assembly accordingto claim 32, wherein said retainer is a metal part.
 34. The armatureshaft assembly according to claim 32, wherein a coating is placed onsaid laminates and retainer to provide additional resistance againstmovement with respect to said shaft.
 35. A power tool, comprising: ahousing; a motor positioned in said housing, said motor comprising: amotor can having two ends, an end cap at each end of said motor can; anarmature mechanism in said motor can, said armature mechanism includinga shaft, a portion of said shaft extending from one of said end caps toreceive a pinion gear; a stator assembly including a pair of magnets; apinion gear positioned on said shaft, said pinion gear including ashoulder extending toward said end cap, said shoulder adapted to limitmovement of said armature mechanism in said motor can; an output coupledwith said motor; an activation member coupled with said motor forenergizing said motor; and a power source coupled with said motor andactivation member for providing power to said tool.
 36. The motorassembly according to claim 35, wherein said shoulder having a desiredlength to enable a clearance between a commutator and the other end capin the event of movement of the armature mechanism.
 37. A power tool,comprising: a housing; a motor positioned in said housing, said motorcomprising: a motor can having two ends with end caps coupled with saidtwo ends of said motor can; an armature assembly rotatably positioned insaid motor can; magnetic mechanism positioned in said motor can, saidmagnetic mechanism including a housing with at least one magnet securedto said housing, said housing including at least one aperture, said atleast one magnet including material filling said at least one aperture,wherein a magnet localization occurs at said at least one aperturereducing susceptibility to demagnetization; an output coupled with saidmotor; an activation member coupled with said motor for energizing saidmotor; and a power source coupled with said motor and activation memberfor providing power to said tool.
 38. The motor according to claim 37,wherein said housing being a ring member positioned in said motor can.39. The motor can according to claim 38, wherein said motor can includesat least one aperture aligned with said housing at least one apertureand said motor can aperture receiving magnet material.
 40. The motor canaccording to claim 37, wherein said motor can being said housing andincluding said at least one aperture.
 41. A flux ring for a motorcomprising: an annular member; a member for securing at least one magneton said annular member; and an alignment member, said alignment memberassociated with said annular member for aligning said annular memberwith the magnets and with a motor can.
 42. The flux ring according toclaim 41 wherein said alignment member being a notch in said annularmember.